Apparatus for Measuring Three-Dimensional Profile Using LCD

Abstract

Provided is an apparatus for measuring a three-dimensional profile using a LCD in which a sine wave pattern is formed on a measurement object, whereby image information of the measurement object is obtained using the sine wave pattern and a camera, and the image information is analyzed to measure a profile of the measurement object, the apparatus including a LCD projector including: a light source irradiating light forward; a LCD panel disposed at a front side of the light source, generating a sine wave pattern having a plurality of phases and a plurality of periods; polarization plates respectively disposed on front and rear sides of the LCD panel; a first focusing lens disposed apart from a front side of the LCD panel, focusing the sine wave pattern generated by the LCD panel on the measurement object; and a housing supporting the light source, the LCD panel, the polarization plates and the first focusing lens.

1 . An apparatus for measuring a three-dimensional profile using a LCD in which a sine wave pattern is formed on a measurement object, whereby image information of the measurement object is obtained using the sine wave pattern and a camera, and the image information is analyzed to measure a profile of the measurement object,
 the apparatus comprising a LCD projector comprising: a light source irradiating light forward; a LCD panel disposed at a front side of the light source, generating a sine wave pattern having a plurality of phases and a plurality of periods; polarization plates respectively disposed on front and rear sides of the LCD panel; a first focusing lens disposed apart from a front side of the LCD panel, focusing the sine wave pattern generated by the LCD panel on the measurement object; and a housing supporting the light source, the LCD panel, the polarization plates and the first focusing lens.   
     
     
         2 . The apparatus of  claim 1 , wherein the housing comprises a groove in an inner side thereof, to which the first focusing lens is inserted, and the first focusing lens inserted in the groove is disposed apart from the LCD panel at a constant distance. 
     
     
         3 . The apparatus of  claim 2 , wherein the housing comprises a housing for a light source in which a light source is installed, a housing for a LCD in which a liquid LCD panel is installed, and a housing for a lens in which the first focusing lens is installed. 
     
     
         4 . The apparatus of  claim 3 , wherein the LCD panel is combined with a rear surface of the housing for a LCD. 
     
     
         5 . The apparatus of  claim 4 , wherein an optical travel distance from the LCD projector to the measurement object is substantially the same as an optical travel distance from the measurement object to the camera. 
     
     
         6 - 8 . (canceled) 
     
     
         9 . The apparatus of  claim 1 , further comprising a lens system that transfers the sine wave pattern generated by the LCD panel to the measurement object, and transfers image information of the measurement object by the sine wave pattern to the camera. 
     
     
         10 . The apparatus of  claim 5 , further comprising a lens system that transfers the sine wave pattern generated by the LCD panel to the measurement object, and transfers image information of the measurement object by the sine wave pattern to the camera. 
     
     
         11 . The apparatus of  claim 9 , wherein the lens system comprises a stereo-type lens system having two barrels. 
     
     
         12 . The apparatus of  claim 10 , wherein the lens system comprises a stereo-type lens system having two barrels. 
     
     
         13 . The apparatus of  claim 9 , wherein the lens system comprises a zoom lens to be adjusted to a variety of magnification levels. 
     
     
         14 . The apparatus of  claim 10 , wherein the lens system comprises a zoom lens to be adjusted to a variety of magnification levels.